Create SECURITY.md

[JamieSlome]

To let the repository confirm security@twistedmatrix.com as its security contact.

[twm]

Hi @JamieSlome, could you apply this patch so that the build passes?

From f4e4562c0411cb56af94b98bbeab0cb532c1786a Mon Sep 17 00:00:00 2001
From: Tom Most <twm@freecog.net>
Date: Tue, 18 Jan 2022 21:31:31 -0800
Subject: [PATCH] Update MANIFEST.in

---
 MANIFEST.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MANIFEST.in b/MANIFEST.in
index 1d3644e..c68b6d9 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,6 @@
 include pyproject.toml
 include *.rst
+include *.md
 include LICENSE
 include .coveragerc
 recursive-include docs *
-- 
2.29.0

[JamieSlome]

@twm - done ❤️